To use it run from the angular directory:
$ 'docker run --privileged=true -it -v
pwd:/project -u node karol/xvfb'
This will mount the angularjs project to the project directory.
This is also the home directory of the node user.
If node_modules was created on a different platform then rename this ( or delete if ) and run
$ npm install
Once dependencies are installed
$ bower install
$ grunt ....